/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

/**
 * @author Boris Kuznetsov
 */
package org.apache.harmony.security.pkcs7;

import java.util.List;

import org.apache.harmony.security.asn1.ASN1SetOf;
import org.apache.harmony.security.asn1.BerInputStream;
import org.apache.harmony.security.x501.AttributeTypeAndValue;

/**
 * 
 * As defined in PKCS #7: Cryptographic Message Syntax Standard
 * (http://www.ietf.org/rfc/rfc2315.txt): authenticatedAttributes is a set of
 * attributes that are signed (i.e., authenticated) by the signer
 */
class AuthenticatedAttributes {
	private byte[] encoding;
	private final List authenticatedAttributes;

	public static final ASN1SetOf ASN1 = new ASN1SetOf(
			AttributeTypeAndValue.ASN1) {
		@Override
		public Object getDecodedObject(BerInputStream in) {
			return new AuthenticatedAttributes(in.getEncoded(),
					(List) in.content);
		}
	};

	public AuthenticatedAttributes(byte[] encoding, List authenticatedAttributes) {
		this.encoding = encoding;
		this.authenticatedAttributes = authenticatedAttributes;
	}

	public List getAttributes() {
		return authenticatedAttributes;
	}

	/**
	 * Returns ASN.1 encoded form of this authenticatedAttributes.
	 * 
	 * @return a byte array containing ASN.1 encode form.
	 */
	public byte[] getEncoded() {
		if (encoding == null) {
			encoding = ASN1.encode(this);
		}
		return encoding;
	}
}
